| BU Shanfei,JIANG Fulin,WEI Changsheng,ZHANG Yaohui,YANG Fazhan,LIANG Peng.#$NPEffect of Nb-Ti Content on Ductile-brittle Transition and Corrosion Resistance of FeCoNiCrNbxTiy High Entropy Alloy Cladding Layer[J],53(20):118-133 |
| #$NPEffect of Nb-Ti Content on Ductile-brittle Transition and Corrosion Resistance of FeCoNiCrNbxTiy High Entropy Alloy Cladding Layer |
| Received:October 28, 2023 Revised:December 26, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.20.010 |
| KeyWord:high-entropy alloy laser cladding first principles calculation tensile property corrosion resistance |
| Author | Institution |
| BU Shanfei |
School of Mechanical and Automotive Engineering,Shandong Qingdao , China ;Key Laboratory of Industrial Fluid Energy Saving and Pollution Control, Ministry of Education, Qingdao University of Technology, Shandong Qingdao , China |
| JIANG Fulin |
School of Mechanical and Automotive Engineering,Shandong Qingdao , China ;Key Laboratory of Industrial Fluid Energy Saving and Pollution Control, Ministry of Education, Qingdao University of Technology, Shandong Qingdao , China;Collaborative Innovation Center for Mechanized Production Equipment of Major Crops in Shandong Province, Shandong Qingdao , China |
| WEI Changsheng |
School of Mechanical and Automotive Engineering,Shandong Qingdao , China ;School of Mechanical and Automotive Engineering,Shandong Qingdao , China |
| ZHANG Yaohui |
School of Mechanical and Automotive Engineering,Shandong Qingdao , China ;Key Laboratory of Industrial Fluid Energy Saving and Pollution Control, Ministry of Education, Qingdao University of Technology, Shandong Qingdao , China |
| YANG Fazhan |
School of Mechanical and Automotive Engineering,Shandong Qingdao , China ;Key Laboratory of Industrial Fluid Energy Saving and Pollution Control, Ministry of Education, Qingdao University of Technology, Shandong Qingdao , China;Collaborative Innovation Center for Mechanized Production Equipment of Major Crops in Shandong Province, Shandong Qingdao , China |
| LIANG Peng |
School of Mechanical and Automotive Engineering,Shandong Qingdao , China |
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| Abstract: |
| The work aims to study effect of element content on the plastic-brittle transition and corrosion resistance of high-entropy alloy cladding layers, so as to solve the failure of marine equipment bearing parts due to insufficient corrosion resistance and strength and toughness during operation. Firstly, on the premise of using FeCoNiCrNbTi high-entropy alloy system to modify the surface of marine equipment such as ship stern shaft, the element ratio of the high-entropy alloy system was further screened and evaluated according to the first-principles calculation method. The element ratio range of FeCoNiCrNbTi high-entropy alloy was determined. Then, FeCoNiCrNbTi high-entropy alloy was cladded on the surface of typical marine equipment material 42CrMo steel by laser cladding technology to form an FeCoNiCrNbxTiy high-entropy alloy cladding layer to explore the influence law and mechanism of Nb and Ti content on the ductile-brittle transition and corrosion resistance of the FeCoNiCrNbTi high-entropy alloy cladding layer. The results showed that the lattice constants of FCC phase and BCC phase of FeCoNiCrNbTi high entropy alloy decreased with the increase of Ti content, and the decreasing trend gradually slowed down with the increase of Ti content. Through XRD test, it was found that the cladding layer in the phase of the coating was mainly composed of FCC phase, BCC phase and Laves phase. In the cladding layer of the high entropy alloy, with the increase of Nb content, the Laves phase diffraction peak in the cladding layer showed an increasing trend. With the increase of Ti, the BCC phase diffraction peak in the cladding layer showed an increasing trend. It was worth noting that Ti-containing compounds also appeared in the Laves phase. Combined with the scanning electron microscope, it was found that Ti-rich regions also appeared in the FeCoNiCrNbTi high-entropy alloy cladding layer; In the hardness test of FeCoNiCrNbTi high entropy alloy cladding layer, it was found that with the increase of Nb and Ti content, the hardness of FeCoNiCrNbTi high entropy alloy cladding layer showed an upward trend. However, in the tensile test of FeCoNiCrNbTi high entropy alloy cladding layer, it was found that the tensile strength and elongation decreased with the increase of Nb and Ti content. The fracture morphology of high entropy alloy cladding layer was observed by scanning electron microscope. It was found that when the content of Nb element and Ti element increased to 0.3 and 0.5 respectively, the fracture mode changed from ductile fracture to brittle fracture. In the electrochemical corrosion test, it was found that in the FeCoNiCrNbTi high-entropy alloy cladding layer, with the increase of Nb and Ti content, the corrosion resistance gradually deteriorated due to the uneven distribution of the microstructure and the generation of defects. Through the analysis of the above results, it can be concluded that, the proportion of phase and the distribution of microstructure are the main factors affecting the mechanical properties, fracture mode and corrosion resistance of high entropy alloy cladding layer. In FeCoNiCrNbTi high entropy alloy, the increase of BCC phase and Laves phase is conducive to the improvement of microhardness. However, it also leads to the deterioration of tensile strength and elongation, and even ductile-brittle transition. Moreover, the formation of various phases destroys the uniformity of the tissue composition, and even cracks and other defects become the dominant factors for the deterioration of corrosion resistance. |
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